Examine source code of Rewrite AI

{
  "manifest_version": 2,
  "name": "Rewrite AI",
  "version": "1.0.0",
  "description": "Rewrite any selected text instantly using AI. Supports Groq (free), Google Gemini, and OpenAI.",
  "browser_specific_settings": {
    "gecko": {
      "id": "rewrite-ai@extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "contextMenus",
    "storage",
    "activeTab",
    "https://api.groq.com/*",
    "https://api.openai.com/*",
    "https://generativelanguage.googleapis.com/*"
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content.js"
      ]
    }
  ],
  "options_ui": {
    "page": "settings/settings.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_popup": "ui/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "commands": {
    "trigger-rewrite": {
      "suggested_key": {
        "default": "Ctrl+Shift+X",
        "mac": "Command+Shift+X"
      },
      "description": "Trigger AI rewrite on selected text"
    }
  }
}